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Old November 16th, 2017, 04:33 PM   #12421
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Quote:
Originally Posted by ChrisZwolle View Post
Bicycles and pedestrians are usually guided through the median, which means they have to cross over four times. DDIs are better suited for rural or suburban locations with few or no cyclists and pedestrians, or if nearby alternate routes are available for them.
Four. Which is the same number of crossings as a diamond interchange with right turn channels. No interchange design is exceptionally good for pedestrian and bicycles. A diverging diamond doesn't seem really any worse than a more conventional interchange to me either.

I actually like the fact that the median sidewalk tends to be barrier separated on a DDI interchange, up here in the great white north, conventional sidewalks on overpasses tend to end up getting used as snow storage instead of a pedestrian facility in the winter time.
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Old November 16th, 2017, 06:49 PM   #12422
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Interstate 269 in Mississippi

I-269 in Northern Mississippi. It is part of an outer loop of Memphis. This section is planned to open soon.


Photo by 'Brooks' of the AAroads forum
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Old November 19th, 2017, 11:28 PM   #12423
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Interstate 15 -- California.

The tolled express lanes in the median of the freeway has a movable central concrete median barrier. This allows the express lanes to be reconfigured from the pictured 2x2 configuration to a 3x1 configuration to better manage peak directional flows into San Diego:


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg


http://www.asphaltplanet.ca/CA/I/15/...pr16_24x16.jpg
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Old November 20th, 2017, 04:33 AM   #12424
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Really nice pictures. That looks like it would be a lot of fun to drive on as long as traffic is moving well, with the combination of it being monstrous and winding through the geography. How is that barrier moved? I imagine some sort of truck pushes or pulls it over like a snow plow would clear a lane but of course with a different sort of attachment.
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Old November 20th, 2017, 04:35 AM   #12425
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^ The express lanes use a zipper barrier system. It's moved with a special zipper barrier machine:

https://en.wikipedia.org/wiki/Barrier_transfer_machine
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Old November 20th, 2017, 05:46 AM   #12426
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I-287 across the Tappan Zee Bridge in New York State (single span - 7 lanes) used the same system before the bridge was replaced.



here's one on the Golden Gate

https://www.youtube.com/watch?v=hMkLcAstxgA

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Old November 20th, 2017, 11:25 PM   #12427
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6 free lanes northbound and southbound..........WOW! Even I-10 from west Houston to Katy, Texas is not that wide.
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Old November 21st, 2017, 02:57 AM   #12428
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9 lanes in the peak direction too! First highway I've seen that matches the 401 in terms of peak direction capacity..
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Old November 21st, 2017, 06:16 AM   #12429
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That's a sick machine, thanks for sharing that. I have never seen that kind of thing before. I think in terms of planning and land use, it's a more advantageous situation to have a really wide freeway instead of two or three that go roughly parallel, because people will always pick the shortest route anyway. So I have heard, at least. Nice seeing freeways like that in warm, dry climates too. They always look like they're in great shape, mostly.
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Old November 21st, 2017, 05:11 PM   #12430
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I-66 Northern Virginia

Governor McAuliffe and Partners Break Ground on I-66 Outside the Beltway Express Lanes Project

~Virginia’s largest public-private partnership project to provide $3.7 billion in transportation improvements to I-66 Corridor in Northern Virginia~

Governor Terry McAuliffe today joined the Virginia Department of Transportation (VDOT), Department of Rail and Public Transportation, federal, state and local partners, and the Commonwealth’s private partner, I-66 Express Mobility Partners (EMP), to break ground on the I-66 Outside the Beltway Express Lanes Project, which will deliver about $3.7 billion worth of transportation improvements benefitting Northern Virginia’s I-66 Corridor. Governor McAuliffe also announced that construction will be funded completely by the private consortium building the project and that the group has provided nearly $579 million for additional improvements in the corridor.

The project will modify nearly 23 miles of I-66 providing two express lanes in each direction alongside three regular lanes from I-495 to University Boulevard near Route 29 in Gainesville, with dedicated express lanes access points, and space in the median reserved for future transit.

Under a 50-year partnership agreement that protects the public, I-66 EMP assumes responsibility for all costs to design, build, operate and maintain the 66 Express Lanes. This agreement requires zero public investment and requires EMP to pay $800 million for transit service in the corridor and $350 million in other projects to improve the I-66 corridor over the next 50 years. The project’s financial close was reached on November 9, securing the funding necessary to move forward.

The express lanes are scheduled to open by the end of 2022. Key interim improvements are scheduled to be delivered ahead of 2022, such as more than 900 new commuter parking spaces by the summer of 2019, and improvements to the busy Route 28 involving the removal of traffic signals by the summer of 2020.
Full press release: https://governor.virginia.gov/newsro...rticleId=21812

This is one of the largest road projects in the United States;

* $ 3.7 billion
* 23 miles (42 km) of I-66 expansion
* 6 general purpose lanes
* 4 express lanes
* US 29 in Haymarket to I-495
* completion in 2022
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Old November 21st, 2017, 08:13 PM   #12431
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Quote:
Originally Posted by hammersklavier View Post


TxDOT would be better off spending that $$$ completing the TX-45 beltway around the west side and the US-183 beltway around the east side IMO. Maybe make TX-360 a beltway as well. Or connecting TX-1 to I-35 at Round Rock and Buda...
If 45 west is ever completed, it will be the most expensive suburban highway in US history, and will face enormous, well-heeled opposition.
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Old November 21st, 2017, 08:28 PM   #12432
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It seems like Austin's version of Atlanta's never built Northern Arc.
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Old November 22nd, 2017, 02:54 AM   #12433
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Quote:
Originally Posted by gregduh View Post
I think in terms of planning and land use, it's a more advantageous situation to have a really wide freeway instead of two or three that go roughly parallel, because people will always pick the shortest route anyway. So I have heard, at least.
After a certain number of lanes, every new lane has less marginal benefit. Drivers have difficulty filling in empty spaces because they can't see (or change) lanes that are 5 lanes away from them. So, some lanes end up with slower traffic while some others are under occupied.

Also, if there is an emergency, the entire set of lanes in that direction could be shut down. If there are multiple smaller freeways, then there are always alternate routes available. One can see this benefit in collector express systems as well.
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Old November 22nd, 2017, 04:04 AM   #12434
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I-430 bridge from Two Rivers Park by Arkansas Highways, on Flickr
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Old November 22nd, 2017, 04:06 AM   #12435
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Quote:
Originally Posted by gregduh View Post
That's a sick machine, thanks for sharing that. I have never seen that kind of thing before. I think in terms of planning and land use, it's a more advantageous situation to have a really wide freeway instead of two or three that go roughly parallel, because people will always pick the shortest route anyway. So I have heard, at least. Nice seeing freeways like that in warm, dry climates too. They always look like they're in great shape, mostly.
But different parallel roads may well be shorter for their users, like for example people who reside and work in a "north" area of an urban agglomeration, as opposed to an extra south/north jog to access a "central artery".
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Old November 22nd, 2017, 06:01 AM   #12436
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Conceptual interchange for I-35E @ U.S. 287 in Waxahachie, TX.

Would be DFW's southernmost interchange.

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Old November 22nd, 2017, 05:32 PM   #12437
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It seems like Austin's version of Atlanta's never built Northern Arc.
It is, but if you were trying to put it in the middle of Marin County, CA. On the right, you'd have concerns about property values, and on the left, you'd have concerns about property values and environmental impact. It wouldn't surprise me to see 80% opposition in potentially impacted neighborhoods.

Add the rugged terrain, along with the requirement for commercial takings and a new bridge over the Colorado River, and the per-mile cost of the highway would be astronomical.
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Old November 22nd, 2017, 08:42 PM   #12438
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https://twitter.com/CNN/status/933387579659112453

LA Thanksgiving day traffic made the NEWS. Again.......................

<blockquoteclass="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">Aerial footage shows traffic gridlock in Los Angeles as the Thanksgiving travel rush begins <a href="https://t.co/7CTE58NLuz">pic.twitter.com/7CTE58NLuz</a></p>&mdash; CNN (@CNN) <a href="https://twitter.com/CNN/status/933387579659112453?ref_src=twsrc%5Etfw">November 22, 2017</a></blockquote> <script asyncsrc="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
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Old November 23rd, 2017, 02:04 AM   #12439
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Quote:
Originally Posted by Abhishek901 View Post
After a certain number of lanes, every new lane has less marginal benefit. Drivers have difficulty filling in empty spaces because they can't see (or change) lanes that are 5 lanes away from them. So, some lanes end up with slower traffic while some others are under occupied.

Also, if there is an emergency, the entire set of lanes in that direction could be shut down. If there are multiple smaller freeways, then there are always alternate routes available. One can see this benefit in collector express systems as well.
Thus collector express systems, allows the benefits of narrower highways while still providing a single corridor over all. You can comfortably get up to 10 lanes in each direction with that setup.
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Old November 23rd, 2017, 08:04 AM   #12440
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Quote:
Originally Posted by redspork02 View Post
https://twitter.com/CNN/status/933387579659112453

LA Thanksgiving day traffic made the NEWS. Again.......................
A perfect depiction of induced demand. "The 405" (bleh) just got expanded at the cost of $1 billion and really doesn't look any different during peak periods.

The Sepulveda Pass Metro line can't come soon enough.
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